Next turn on "Show all files and folders, including hidden and system". See how HERE

Go to start > run and type services.msc. Press the enter key.
Search for the following services. Double click to select stop if they are running. Set the startup type to disabled. Click apply/ok for each service you disable.

GPLv3
DomainService

Open your task manager by pressing holding ctrl, alt and pressing del. Alternatively, use ctrl + shift + esc. Go to the processes tab, and end the following processes, if found:

Ask Toolbar

After that, run HijackThis and fix the following entries, if found (do this by placing a tick in the check boxes beside these entries and clicking "Fix checked"):